Thanks Andres!
I already tried the optional relationship thing, but not the WHERE clause.
However, there is a problem which I have with or without the WHERE (I'm
using neo4j 1.5M02):
START callee=node:node_auto_index('type:*Service') MATCH
p=(caller)-[r?:CALLS]->(callee) WHERE r IS NULL RETURN p
Exception in thread "main" java.lang.AssertionError: assertion failed
at scala.Predef$.assert(Predef.scala:89)
at org.neo4j.cypher.PathImpl.<init>(PathImpl.scala:34)
at
org.neo4j.cypher.pipes.NamedPathPipe$$anonfun$foreach$1.apply(NamedPathPipe.scala:50)
at
org.neo4j.cypher.pipes.NamedPathPipe$$anonfun$foreach$1.apply(NamedPathPipe.scala:39)
at
org.neo4j.cypher.pipes.MatchPipe$$anonfun$foreach$1$$anonfun$apply$1.apply(MatchPipe.scala:37)
at
org.neo4j.cypher.pipes.MatchPipe$$anonfun$foreach$1$$anonfun$apply$1.apply(MatchPipe.scala:37)
at
scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)
at scala.collection.immutable.List.foreach(List.scala:45)
at
org.neo4j.cypher.pipes.MatchPipe$$anonfun$foreach$1.apply(MatchPipe.scala:37)
at
org.neo4j.cypher.pipes.MatchPipe$$anonfun$foreach$1.apply(MatchPipe.scala:36)
at
org.neo4j.cypher.pipes.StartPipe$$anonfun$foreach$1$$anonfun$apply$1.apply(StartPipe.scala:36)
at
org.neo4j.cypher.pipes.StartPipe$$anonfun$foreach$1$$anonfun$apply$1.apply(StartPipe.scala:35)
at scala.collection.Iterator$class.foreach(Iterator.scala:652)
at
scala.collection.JavaConversions$JIteratorWrapper.foreach(JavaConversions.scala:573)
at scala.collection.IterableLike$class.foreach(IterableLike.scala:73)
at
scala.collection.JavaConversions$JIterableWrapper.foreach(JavaConversions.scala:587)
at
org.neo4j.cypher.pipes.StartPipe$$anonfun$foreach$1.apply(StartPipe.scala:35)
at
org.neo4j.cypher.pipes.StartPipe$$anonfun$foreach$1.apply(StartPipe.scala:34)
at org.neo4j.cypher.pipes.ParameterPipe.foreach(ParameterPipe.scala:27)
at org.neo4j.cypher.pipes.StartPipe.foreach(StartPipe.scala:34)
at org.neo4j.cypher.pipes.MatchPipe.foreach(MatchPipe.scala:36)
at org.neo4j.cypher.pipes.NamedPathPipe.foreach(NamedPathPipe.scala:39)
at
scala.collection.TraversableLike$class.filter(TraversableLike.scala:212)
at org.neo4j.cypher.pipes.Pipe.filter(Pipe.scala:31)
at org.neo4j.cypher.pipes.FilterPipe.foreach(FilterPipe.scala:30)
at org.neo4j.cypher.pipes.TransformPipe.foreach(TransformPipe.scala:38)
at
org.neo4j.cypher.pipes.ColumnFilterPipe.foreach(ColumnFilterPipe.scala:34)
at
scala.collection.generic.Growable$class.$plus$plus$eq(Growable.scala:48)
at
scala.collection.mutable.ListBuffer.$plus$plus$eq(ListBuffer.scala:128)
at
scala.collection.TraversableOnce$class.toList(TraversableOnce.scala:242)
at org.neo4j.cypher.pipes.Pipe.toList(Pipe.scala:31)
at
org.neo4j.cypher.ExecutionResult$class.dumpToString(ExecutionResult.scala:61)
at
org.neo4j.cypher.ExecutionEngine$$anon$1.dumpToString(ExecutionEngine.scala:119)
at sandbox.GraphQuery.doQuery(GraphQuery.java:85)
at sandbox.GraphQuery.run(GraphQuery.java:73)
at sandbox.GraphQuery.main(GraphQuery.java:30)
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